milehighgirl ooh lala!
such a cool nursery that I've been interested in for a while.
Do either assuming the trees are good for your zone
even though some will ultimately live in Iowa?
I have planted in pots for years since many nurseries ship dormant plants
to me mid or even late spring when the Ga sun is hot blazin.
Then must wait till fall so not to lose all the delicate feeder roots just developed *sigh*
You don't have to plant the pots if trees are hardy 2 zones less than yours just keep out of wind surround with deep mulch..... oh wait I just looked at your zone thats not likely.
So get diggin!
I do love a fellow dirt diggin chick, I dug 3 monster holes today for new DW trees.

I think it depends on how cold your garage is. If it is too warm, they will come out of dormancy earlier than you'd like. But if it stays under ~40, I think that is probably the easier option (vs digging a bunch of holes). Another thing to consider would be fabric pots, which you could later plant with the tree (no root loss). Of course, you may already have some other kind of pot handy and it could take some time to get the fabric ones delivered. If you do decide to get some online, check out Root pouches from Greenhousemegastore. Shazaam (from this forum) suggested it to me and I was pretty happy with my recent order- better price than the places I got them last year and they seem pretty sturdy (a very preliminary assessment).

Did you request Feb delivery? It seems a bit early for zone 5. I ordered from Tierra Madre this past fall and I think I asked for March, but I'm not sure and don't see it on my receipt. It does say that they deliver bare root from Jan to April.